钙离子可能参与放线菌素D诱导的玉米细胞凋亡

钙在动物细胞凋亡的信号转导中起重要作用,其最直接的作用是激活钙依赖性核酸酶,导致DNA的特异片段化.然而,关于钙在植物细胞程序性死亡中的作用的报道很少.本文以玉米根尖分生组织为材料,利用RNA合成剂放线菌D诱导细胞死亡,并从形态和生化方面检测到这种细胞死亡是一种程序性死亡(programmed cell death,PCD).利用钙离子特异性结合荧光染料wazo-1研究的结果表明,在死亡程序启动的瞬间,胞质内钙离子浓度急骤上升.意味着钙信号转导途径可能参与了这种PCD.这种PCD在DNA严重断裂之前是可以逆转的.     

家兔死后时间与血浆中分子物质的含量

中分子物质在血浆中的含量与体内蛋白质的分解代谢有关。动物死亡后体内蛋白质分解加快,故随着死后时间的延长血浆中的中分子物质呈进行性增高。本文报告通过观察家兔死后的不同时间与血浆中的中分子物质的含量变化,发现二者呈正相关,相关系数 r=0.9904。因此,只要测出血浆中的中分子物质的含量,再代入公式X=1.2353y-355即可计算出动物死后的时间(分钟),这对法医确定死后时间很有帮助。     

种群死亡定律的研究

本文详细了研究了种群纯死定律的概率结构，给出了求解转移概率显式的三种方法及一个定理，最后拟合了一个实例。     

部分服务台同步单重休假的M/M/c排队系统

本文研究只允许一部分服务台进入休假状态的M／M／c排队系统，在同步单重休假策略下，给出了稳态指标分布，证明了已知服务台全忙条件下的随机分解结果．     

Programmed cell death during terminal bud senescence in a sympodial branching tree, Eucommia ulmoides

Eucommia ulmoides Oliv. is a typical sympodial branching tree. The apical bud of the branch ages and dies every year, replaced by the nearby axillary bud in the second year. Structural assays and a series of biochemical analyses were performed to analyze the senescence mechanism in the apical bud. It was revealed that most cells of the apical bud underwent the programmed cell death (PCD) during the senescence: the chromosomes were congregated and the nuclear contents were condensed, as shown by 4′,6-diamidino-2-phenylindole (DAPI) fluorescence. DNA fragmentation was detected during senescence using the terminal deoxynucleotidyl transferase (TdT)-mediated dUTP nick end in situ labeling (TUNEL) method, coincident with the appearance of a DNA ladder. Moreover, a 20 kD DNase related to fragmentation was found. PCD was initiated first in the young leaves, leaf primordia and peripheral zone cells, then in the central mother cells and initial layer cells in the apical meristem. The terminal buds remain in vegetative growth during senescence, in contrast to buds of many annual plants.     

论抢劫罪中的非必要的故意杀人

在抢劫案中,犯罪分子恣意滥杀被害人的情况常有发生,区分必要的故意杀人和非必要的故意杀人,将非必要的故意杀人排除在抢劫“致人死亡”之外,可以让“杀人犯”现身并给予处罚。这种区分有利于澄清长期以来的模糊认识和理论分歧,既有利于震慑和惩治“杀人犯”,又有助于使被害人免遭滥杀。     

在悬崖边舞蹈的灵魂--试论弗吉利亚·吴尔夫的死亡意识

弗吉利亚·吴尔夫由于其特殊的生活经历和独特的个性,一生都处在生与死的纠缠之中.一方面,死亡的意念挥之不去,另一方面,她又与这种意念不懈地抗争.生存还是毁灭的思考成为她作品的重要主题,同时她也力图通过创作探寻到存在的终极意义.     

从"兄终弟继"说开去--兼与何正廷先生商榷

“兄终弟继”的婚俗并非壮族所独有，汉族和其他少数民族也有。侬全福和侬夏卿虽为同族，都姓侬，但不是亲兄弟，也不是堂兄弟或拜把兄弟，是否同宗史料没有记载。因此，阿侬嫁给侬夏卿是不能算“兄终弟继”的。     

Evolution on a smooth landscape

We study in detail a recently proposed simple discrete model for evolution on smooth landscapes. An asymptotic solution of this model for long times is constructed. We find that the dynamics of the population is governed by correlation functions that although being formally down by powers ofN (the population size), nonetheless control the evolution process after a very short transient. The long-time behavior can be found analytically since only one of these higher order correlators (the two-point function) is relevant. We compare and contrast the exact findings derived herein with a previously proposed phenomenological treatment employing mean-field theory supplemented with a cutoff at small population density. Finally, we relate our results to the recently studied case of mutation on a totally flat landscape.     

论《野草》中的自我想像

《野草》折射出鲁迅在新的人生阶段对于自我的崭新认识与想像，其主要内涵由三个层面构成：历史中间物意识，死亡意识，反抗意识。对于作者当时的心灵困窘而言，此想像具有一定的调解功效，然而却难以从中获得更为根本的拯救。作者借此构成了“野草”式的自我命名。